Self-grinding valve



Patented Nov. 16, 1925.

' pairs STATES reams onasnan, sonrir manor. new ,inasnfr. I

sn '..renrnnrns VALVE.

Application filed March .23, 1926. Serial. No. 96,753.

This invention relates to self-grinding valves and has particular reference to an automatic means for grinding the valves of an internal combustion motor coincident with the operation of themotor.

One of the principal objects of the present invention is to provide a mechanism operable by the lift movement of one valve for imparting turning movement to an adjacent seated valve to set up a grinding action be tween the face of said valveand its seat.

The invention furthermore comprehends a mechanism of the character set forth which is capable of being rendered active and inactive at the option of the driver so that the same may be brought into play only when necessary.

The invention aims as a still further ob ject to provide an automatic valve-grinding mechanism for internal combustion motors which is comparatively simple in its construction, ineX aensive to produce and install, and which is thoroughly reliable and highly eflicient in .its purpose.

lVith the above recited and other objects in view, reference is had to the following specification and accompanying drawings in which there is exhibited one example or embodiment of the invention which is in no way intended as a limitation upon the scope of the appended claim as it is to be clearly understood that variations and modifications which properly fall within the scope of said claims may be resorted to when found expedient.

In the drawings-- Figure 1 is a fragmentary vertical sectional view of a motor illustrating a valvegrinding mechanism constructed in accordance with the invention associated therewith; I

Fig. 2 is a similar view illustrating the operation of the device;

Fig. 8 is a sectional plan view taken approximately on the line 3-3 of Fig. 1;

Fig. 4: is a detail fragmentary vertical sectional view taken approximately on the line 44 of Fig. 2.

Referring to the drawings by characters of reference, designates a portion of a motor vehicle provided with adjacent valve seats 11 and 12, with which poppet valves 13 and 14: are designed to co-operate, the valves being provided with stems 15 and 16 which are periodically lifted to unseat the valves, by the usual lift cams 17 and 18,

springs 19 being employed for seating the valves. i

, In order to provide means for automatically grinding the valves, the valve stem 15 and 16 have secured thereto gears 20 and 21, each including an annular rim provided, respectively, with teeth 22 and. 28,. radial spokes 24 and 25, and hubs 26 and 27. The gears are coupled or connected for simultaneous corresponding movement by an intermediate idler gear 28, the teeth 29. of which mesh, respectively, with the teeth 22 and 23 of the gears 20 and 21. A stationary bracket 30 is supported from a stationary part of the motor lOadjacent each of the gears 20v and 21 and is provided with'a depending dog 31 having an inclined face 32 at its'lower end. The dogsbeing, respectively, disposed in the path of movement of "the spokes of the gears, whereby one stem. ,or valve is lifted, rotatory movement will be imparted thereto by the interengagement of the spokes of the valve-stem gear with the inclined face of the dog, said rotatory movement being transmitted through the idler gear 28 to the adjacent sea-ted valve to set up a grinding ac tion. In order to compensate for the relative axial movement of the gears 20 and 21 with respect to the intermediate idler gear 28, the said idler gear is of greater thickness than the valve stem gears.

From the foregoing it thus follows that during the operation of the motor the valve which is being lifted, will, due to the mechanism heretofore described, transmit turning movement to the adjacent seated valve so that a grinding action is set up between the engaging faces of the valve and its seat. In order to regulate the degree of turning movement which will be imparted to the valves, the brackets 30 are formed with slotted bases 33 through which bolts 34 extend to allow for lateral adjustment.

It is obvious that it will be impracticable to allow the valve-grinding means to operate continuously, and in order to render the device periodically operable at the option of the driver, the dogs 31 are pivotally associated with the brackets at 35 and main tained either in active or inactive positions by means of a spring or other retaining device 36, which serves to hold the dogs in their shifted active and inactive positions. The spring 36 also allows for a slight rocking of the dogs to compensate for wear and to-permit of clearance.

What is claimed is:

1. An automatic means for grinding valves of an internal combustion motor when in operation, comprising mechanism operable by the vertical movement of one valve for imparting turning movement to the adjacent seated valve, whereby to set up a grinding action between the face of said valve and its seat, said mechanism including a pair of gears secured respectively to the stems of an adjacent pair of valves, an idler gear meshing respectively with the valve stem gears and coupling said valve stem gears for corresponding turning movement, means on the valve stem gears, and coacting stationary means in the path of movement of said first means for imparting turning movement to the valve stems upon a vertical lift movement applied to one of the valve stems by the usual valve-lifting means. 5

2. An automatic means for grinding valves of an internal combustion motor when in operation, comprising mechanism operable by the vertical movement of one valve for imparting turning movement to the adjacent seated valve, whereby to set up a grinding action between the face of said valve and its seat, said mechanism including a pair of gears secured respectively to the stems of an adjacent pair of valves, an idler gear meshing respectively with the valve stem gears and coupling said valve stem gears for corresponding turning movements, radial spokes on the valve stem gears,

the valve stems by the usual alve-lifting means.

3. An automatic means for grinding valves oi? an internal combustion motor when in operation, comprising mechanism oper able by the vertical movement of one valve for imparting turning movement to the adjacent seated valve, whereby to set up a grinding action between the face of said valve and its seat, said mechanism including a pair of gears secured respectively to the stems of an adjacent pair of valves, an idler gear meshing respectively with the valve stem gears and coupling said valve stem gears for corresponding turning movements, radial spokes on the valve stem gears, stationary supports, and dogs having inclined faces at the lower ends carried by and depending from said stationary supports in the path of movement of the spokes of the valve stem gears for imparting turning movement to the valves and their stems upon vertical lift movement imparted to one of the valve stems by the usual valve-lifting means, said dogs being mounted for shifting movements to active and inactive positions.

FRANK J MONAGI-IAN. 

